JP2005207653A - Combustion hot air heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inhibit the generation of prompt NOx by preventing the air from being excessively supplied to a base part of primary combustion flame of the primary and secondary combustion flames formed at a flame formation part. <P>SOLUTION: In this combustion hot air heater comprising a burner 11, a burner base 1 for mounting the burner 11, a heat chamber 2 mounted on an upper face of the burner base 1 to cover the burner 11, and an air blower 3 mounted on a back face of the heat chamber 2, a draft guide 16 is mounted for guiding the air flowing into the heat chamber 2 from a clearance 25 between a back wall lower part of the heat chamber 2 opposite to the air blower 3 and the burner base 1, to an upper position with respect to an area where the burner 11 is mounted in the combustion cylinder 2, to prevent the air flowing into the combustion cylinder 2 from the clearance 25 from being brought into contact with the flame formation part 12 of the burner 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a combustion hot air heater that performs heating by dissipating high-temperature combustion gas obtained by burning fuel into a room.

  Conventionally, this type of combustion hot air heater has a structure as shown in FIGS. FIG. 3 is a perspective view of the main part showing the positional relationship between the combustion cylinder and the blower. 4 is a cross-sectional view taken along line A-A 'of FIG.

  In the figure, 1 is a burner base, 2 is a combustion cylinder attached to the burner base 1, and 3 is a blower provided on the back surface of the combustion cylinder 2.

  Reference numeral 4 denotes a secondary air intake port opened on the side surface of the combustion cylinder 2, and reference numeral 5 denotes an intake flap for efficiently taking in secondary air through the secondary air intake port.

  Reference numeral 6 denotes a base flange, which is bent on four sides of the skirt for attaching the combustion cylinder 2 on the burner base 1. Reference numeral 7 denotes a mounting screw for overlapping the base flange 6 on the burner base 1 and fixing it.

  8 is a vaporizer for vaporizing liquid fuel, 9 is a sheathed heater that is attached to the vaporizer 8 and heats the vaporizer 8, 10 is a nozzle from which the fuel vaporized by the vaporizer 8 is ejected, 11 is its A burner that receives and burns the fuel gas ejected from the nozzle 10, 12 is a flame forming part of the burner 11, 13 is exposed to the flame generated in the flame forming part 12, and extracts a part of the combustion heat, A heat receiving rod supplied to the vaporizer 8.

  Reference numeral 14 denotes a primary air introduction port which is opened in the burner base 1 in order to introduce a part of the air blown from the blower 3 to the nozzle 10 side on the lower surface of the burner base 1 as primary air.

  Reference numeral 15 denotes a secondary air introduction port, which is a relatively lower position of the back wall of the combustion cylinder 2 facing the blower 3 and is directly exposed to the air blown from the blower 3, and the blower 3 blows air. A part of the air is used as a secondary air to actively flow in from above the region where the burner 11 at the bottom in the combustion cylinder 2 is provided.

  Reference numeral 25 denotes a gap, and a base flange 6 bent at four sides of the bottom of the combustion cylinder 2 is overlapped on the burner base 1 and attached with a mounting screw 7 to attach the combustion cylinder 2 onto the burner base 1. Therefore, it is a gap generated at the connecting portion between the combustion cylinder 2 and the burner base 1.

  In the conventional example having such a structure, during the heating operation, the air flowing in from the primary air inlet 14 opened in the burner base 1 is naturally supplied to the burner 11 by the ejector effect of the vaporized fuel ejected from the vaporizer nozzle 10. It is sucked and used as primary air necessary for combustion. On the other hand, the air flowing in from the secondary air inlet 15 of the combustion cylinder 2 is used as secondary air for combustion. The combustion in the combustion cylinder 2 in this way suppresses the generation of nitrogen oxides, and the resulting high-temperature combustion gas is diffused into the room for heating.

JP 2000-9346 A

  However, in the above prior art, the air flowing into the combustion cylinder 2 from the gap 25 that is unavoidably formed in the lower portion of the back wall of the combustion cylinder 2 facing the blower 3 and the connection portion with the burner base 1 is burned. The air flows into the boundary region where the burner 11 at the bottom of the cylinder 2 is provided in the region where the burner 11 is provided, and thereby transitions from the primary combustion flame formed in the flame forming unit 12 to the secondary combustion flame. As a result, a combustion reaction occurs positively in 11 parts of the burner, and the generation of prompt NOx of nitrogen oxides is promoted.

  The present invention has been made to solve the above-described problems, and is provided with a burner having a flame forming portion, a burner base to which the burner is attached, and an upper surface of the burner base so as to cover the burner. In a combustion hot air heater provided with a combustion cylinder and a blower provided at the back of the combustion cylinder, the combustion pipe flows into the combustion cylinder through a gap between the lower portion of the rear wall of the combustion cylinder facing the blower and the burner base. A crevice wind guide is provided to guide the air to an upper position from a region where the burner in the combustion cylinder is attached, so that air flowing into the combustion cylinder from the gap does not hit the flame forming portion of the burner. is there.

  The combustion hot air heater according to the present invention is configured as described above, so that air flowing into the combustion cylinder through a gap that is unavoidably formed at the connection between the lower portion of the rear wall of the combustion cylinder and the burner base. Compared with thermal NOx because it is guided by the air gap guide to the upper position from the area where the burner at the bottom in the combustion cylinder is provided and does not directly hit the primary combustion flame formed in the flame formation part of the burner Prompt NOx of nitrogen oxide, which is said to be easily generated in a low temperature environment, can be extremely effectively suppressed.

  In addition, in the operation of fixing the combustion cylinder to the burner base with screws, the generation state of nitrogen oxide prompt NOx does not change even if the gap interval varies due to operation variation, etc. Thus, it is possible to provide a combustion hot air heater that can be suppressed.

  An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a cross-sectional view of a burner portion of a combustion hot air heater for explaining an embodiment of the present invention, FIG. 2 is a perspective view of a gap air guide, and FIG. 3 illustrates a conventional example and an embodiment of the present invention. The principal part perspective view which shows the positional relationship of a combustion cylinder and an air blower, FIG. 4 is AA 'line arrow sectional drawing of FIG.

  The description of the same configuration as that described in the conventional example is omitted.

  In the figure, reference numeral 16 denotes a draft air guide, which is connected to the burner base 1 by welding, and is avoided at the lower portion of the back wall of the combustion cylinder 2 fixed to the burner base 1 by means of mounting screws 7 and the connection portion between the burner base 1. The air that flows into the combustion cylinder 2 from the gap 25 that is apt to be formed is guided to a position above the region where the burner 11 at the bottom of the combustion cylinder 2 is provided.

  Reference numeral 17 denotes a flame holding partition wall, which is installed around the flame forming portion 12 of the burner 11 with a predetermined height.

  Reference numeral 18 denotes a secondary combustion flame adhering portion formed at the upper edge of the flame holding partition wall 17, and this secondary combustion flame adhering portion 18 is formed to project outward in a flange shape as shown in the figure. It is.

  Reference numeral 19 denotes a primary combustion flame formed in the flame forming section 12, and a flame is formed without being particularly affected by the presence of the flame holding partition wall 17.

  Reference numeral 20 denotes a secondary combustion flame, which is formed by adhering the root portion to the secondary combustion flame adhering portion 18 on the upper edge of the flame holding partition wall 17 outside the primary combustion flame 19. The root thickness of the secondary combustion flame 20 attached to the secondary combustion flame adhering portion 18 corresponds to the width of the secondary combustion flame adhering portion 18, and a sufficient distance from the root portion of the primary combustion flame 19. It is formed with.

  Next, the effect | action by the above structure is demonstrated. Since the flame holding partition wall 17 is provided around the flame forming portion 12 of the burner 11, even if secondary air that has flowed into the upper portion of the combustion cylinder 2 wraps around by the convection, it is formed in the flame forming portion 12. The primary combustion flame 19 is not directly supplied to the root portion.

  Further, a secondary combustion flame adhering portion 18 is formed on the upper edge portion of the flame holding partition wall 17 in a flange shape toward the outside thereof, and the root portion of the secondary combustion flame 20 is used as the secondary combustion flame adhering portion. 18, since the root portion of the primary combustion flame 19 is covered with the root portion of the secondary combustion flame 20 having a sufficient thickness, the secondary combustion flame 20 moves to the root portion of the primary combustion flame 19. The secondary air is not supplied excessively, and the flow of the secondary air into the root of the primary combustion flame 19 is greatly reduced as compared with the case where the secondary combustion flame adhering portion 18 is not provided. As a result, it is possible to prevent the problem that a positive combustion reaction occurs in the burner 11 part due to the flow of the secondary air and the generation of the prompt NOx of nitrogen oxides is promoted.

  In addition, air flowing into the combustion cylinder 2 from the gap 25 that is unavoidably formed at the connection between the lower portion of the rear wall of the combustion cylinder 2 and the burner base 1 is caused to flow into the combustion cylinder 2 by the gap air guide 16. Is generated in a relatively low temperature environment compared to thermal NOx because the primary combustion flame 19 which is guided to the upper position from the region where the burner 11 is provided and is not directly hit by the flame forming portion 12 of the burner 11 is prevented. The prompt NOx of nitrogen oxides, which is said to be easy to do, can be extremely effectively suppressed.

  Further, in the operation of fixing the combustion cylinder 2 to the burner base 1 with the mounting screw 7, even if the gap 25 varies due to operation variation or the like, the suppression state of the generation of nitrogen oxide prompt NOx does not change. It is possible to provide a combustion hot air heater that can stably suppress the generation of.

It is sectional drawing of the burner part of the combustion hot air heater explaining one Example of this invention. It is a perspective view of a crevice wind guide similarly. It is a principal part perspective view which shows the positional relationship of the combustion cylinder and air blower explaining a prior art example and one Example of this invention. FIG. 4 is a cross-sectional view taken along line A-A ′ of FIG. 3.

Explanation of symbols

1: Burner base 2: Combustion cylinder 3: Blower 11: Burner 12: Flame formation part 16: Gap air guide 25: Gap

Claims (1)

A burner (11) having a flame forming part (12), a burner base (1) to which the burner (11) is attached, and an upper surface of the burner base (1) so as to cover the burner (11). In the combustion hot air heater comprising the combustion cylinder (2) and the blower (3) provided on the back surface of the combustion cylinder (2), the back surface of the combustion cylinder (2) facing the blower (3) The air flowing into the combustion cylinder (2) from the gap (25) between the lower wall portion and the burner base (1) is placed at a position higher than the region where the burner (11) in the combustion cylinder (2) is attached. A guide air gap guide (16) is provided, and the air flowing into the combustion cylinder (2) from the gap (25) is configured not to hit the flame forming part (12) of the burner (11). Combustion hot air heater.

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